I was contacted by a recruiter for a different position I had applied for.

I ended up having a phone screen and a phone interview for this position.

The phone screen was standard. The recruiter explained the interview process and what to expect.

During the phone interview, the interviewer asked questions about Objective-C. There was a programming problem that involved creating a class per specific details.

The task involved copying a linked list. The tricky part, however, was that the objects in the list could refer to one another.